1N5221B-T

Single Zener Diodes Overview

The Diodes Incorporated 1N5221B-T is a discontinued single silicon epitaxial Zener diode housed in a DO-35 glass axial package. It provides a nominal Zener voltage of 2.4V with a ±5% tolerance at a test current of 20mA. The device supports a maximum power dissipation of 500mW and operates within a temperature range of -65°C to +175°C. Electrical characteristics include a maximum dynamic impedance of 30Ω, a forward voltage of 1.1V at 200mA, and a maximum reverse leakage current of 100µA at 1V.

Single Zener Diodes Feature Summary

• Utilizes planar die construction for high stability and reliability
• Features a hermetic glass DO-35 case with solderable terminals
• Compliant with RoHS directives and lead-free finish standards

Single Zener Diodes Applications

• Voltage regulation circuits
• Reference voltage generation
• Overvoltage protection

Single Zener Diodes Procurement Notes

This component is officially marked as obsolete and discontinued by the manufacturer. Procurement must rely on secondary market distributors or surplus inventory channels. Verify the authenticity of the source and inspect the physical condition of the DO-35 package before integration. Confirm that the specific batch meets required environmental compliance standards, as production has ceased.

Single Zener Diodes Selection Notes

Designers should transition to active surface mount equivalents such as the MMSZ52xxB series recommended by the manufacturer. Evaluate thermal resistance and power derating requirements carefully when replacing axial components with SMD variants. Ensure the new selection maintains compatibility with existing PCB footprints or allows for necessary layout modifications.

Single Zener Diodes Part Context

The 1N5221B belongs to the 1N5221B through 1N5267B series of 500mW Zener diodes manufactured by Diodes Incorporated. This family covers a wide voltage range from 2.4V to 75V. The -T suffix specifically denotes tape and reel packaging for automated assembly processes.

Single Zener Diodes Replacement Considerations

The datasheet explicitly recommends using the MMSZ52xxB series as the replacement for this obsolete part number.

Single Zener Diodes FAQ

What is the status of the 1N5221B-T?

The component is officially obsolete and discontinued by Diodes Incorporated.

What is the maximum operating temperature?

The junction and storage temperature range extends up to +175°C.